Machine tool chuck



W. H. WEIMER MACHINE TOOL CHUCK Nov. 7, 1950 Original Filed Sept. 18, 1942 3 Sheets-Sheet 1 g 2.5 s llll IN VE N TOR WILL/AM H. WE/MER ATTORNEY Nov. 7, 1950 w. H. WEIMER MACHINE TOOL CHUCK 3 Sheets-Sheet 2 Original Filed Sept. 18, 1942 Nu Do wwwm NW Q mm Mm 8. wwnmwm 8" IN VENTOR WILLIAM H. WE/MER ATTORNEY I Nov. 7, 1950 w. H. WEIMER 2,529,205

MACHINE TOOL CHUCK Original Filed Sept. 18, 1942 3 Sheets-Sheet 5 IN VEN TOR W/LL/AM H. WE/MER TORNEY Patented Nov. 7, 1950 MACHINE TOOL CHUCK William H. Weimer, North Prairie, Wis., assignor to Davis & Thompson Company, West Allis, 1 Wis., a corporation of Delaware Original application September 18, 1942, Serial No. 458,839, now Patent No. 2,424,524, dated July .22, 1947. Divided and this application December 4, 1943, Serial No. 512,943

The present invention relates to machine tools such as boring machines and the like, and more particularly to chucking means adapted for holding work which is to be subjected to tool opera-' tions.

An bject of the invention is to provide an improvedchucking means for accurately and expeditiously positioning and clamping work of generally cylindrical shape.

Another object is to provide a vchuckingmeans by which tubular articles may be firmly clamped without distortion of the article walls.

4 claims.- (01. 2 79-57.)

Still another object is to provide .article- I chucking means which will facilitate insertion and removal of the articles.

A further object is to provide a chucking means having an improved rotatable mounting and drive.

A still further object is to perfect details of con.- struction generally.

The invention further consists in the several features hereinafter described and claimed.

In the accompanying drawings,

Fig. l is a front elevation of'a boring-machine provided with chucking means constructedin'accordance with the invention, parts of the chucking means being shown in section, andopposed boring heads of the machine being shown in retracted position in readiness to operate on a work piece rotatably carried by the chucking means;

Fig. 2 is a transverse sectional elevation of the machine taken generally along the line .22 of Fig. 1; i

Fig. 3 is a sectional elevation taken generally along the line 33 of Fig. 2, a work piece being mounted in the chucking means; Fig. 4 is a sectional elevation of a portion of the chucking means ona larger scale, taken on the same plane as Fig. 3; V

Fig. 5 is a transverse sectional elevation taken generally along the line 55 of Fig. 4,,and

Fig. 6 is a detail sectionalview of parts of the chucking means. I

In the drawings, 20 designates an elongated bed or base frame which is provided along its upper front and rear portions with longitudinally extending horizontal guideways 23 arranged in parallel relation. -Mou nted on an intermediate portion of the frame and between the guideways is an upstanding stationary housing 26 provided with means hereinafter described for chucking a tubular work piece W which is rotatableon a horizontal axis parallel to the guideways 23. The work piece W may have various forms but it is here shown to be a metal tube open at both ends and having a cylindrical outer surface- Preferably, this outer surface is ground. orotherwise machined before the tube .is .mounted in. the chucking means. y

Slidably mounted on theguideways are two opposed reciprocatory boring heads designated gen; erally by 24 and 25. Each boring head comprises a suitably actuatedcarriage 86 resting onthe guideways and provided with spaced arms8lex+ tending along the. guideways to insurev stability,

these arms being adaptedto straddle the chuck housing 26 .during the travel, of the carriage. Rigidly secured to, the carriage is a forwardly projecting tubular boring .bar .88 which extends coaxially of the mounted tubular work piece. and is adapted to enter the work piece. One or more cutter bits H3 are mounted on the frontend of the boring bar and are suitably controlled to vary the cutting radius.

The work chucking means includes a, hollow or tubular power-driven shaft or spindle 33 journalled in the housing 26 to rotate about a horizontal axis parallelto the guideways ;23. The shaftcarries therein axially spaced sets of. arcuate or segmental work-clamping jaws 34 which are adjustably mounted as hereinafter described to form two collet chucks at oppositeend'portions of the shaft. The tubular work piece is insertible into the hollow shaft 33 so as to project from opposite ends ofthe housing 26, the work piece vbeing insertible from one end of the housing andbeing axially positioned by an annular stop orgage member 35 at the other endof the housing. As seen in Fig. 1, the right-hand boring head 25, in its retracted position, is spaced a sufficient distance from the chuck housing to permit insertion and removal of the work piece. The gage memgber 35, which surrounds the inserted work piece, has an outturned flange 36 rigidly secured to the end of the hollow shaft 33 to rotate with the shaft, and has an inturned stop flange 31 at its outer end engageable with the end of the work piece. The work-rotating shaft 33 is provided near one end with an outwardly projecting flange 38, Fig. 3, laterall engageable with thrust Washers'39 and 40 to prevent axial play of the shaft, the flange and thrust washers being confined by a ring mem ber 4| secured to the housing 26. Oil seals 42 are provided at oppositeends of the shaft.

The chuck jaws 34 are arranged in the hollow shaft 33 in axially spaced sets, four sets of'jaws being shown in the present instance and forming parts of two chuck assemblies each having, two spaced sets of jaws. The two series of jaws for each chuck assembly are held in axiallyspac'ed relation by a guide ring or connector ring 43 concentric with the shaft, the guide ring having inturned annular flanges 44 at opposite ends slidably extending into peripheral grooves 45 formed in-the jaws. The jaws have tapered outer surfaces 46 bearing on correspondingly tapered innersurfaces 41 of wedge rings 48 and 49, the

jaws in each set being urged radially outwardly.

against the associated wedge ring by a resilient expansion ring 50 fitting in aligned grooves 5| formed in the inner cylindrical surfaces of the jaws. chuck assembly have respective right-handand left-hand screw-threaded connections 52 and .53

with respective sleeves 54 and 55 surroundingv the rings, the sleeves being rotatably mounted in the hollow shaft 33 and being confined in the The two wedge rings 48 and '49 of each the outer periphery of the shaft and is secured Y therein by a radially extending screw 16".

A pinion shaft 11 is journalled in the chuck housing in'parallel relation to the hollow shaft 33 and-carries pinions '18 and I9 meshing with the gear sections 14 and I5 respectively,.the pinion shaft against axial movement. At their adjacent ends the two sleeves of each chuck assembly carry respective internal ring gears 56 and are spaced; by ia peripheral projection or flange 51. on theijawspacing ring 43, the projection being. flanked by thrust washers 58; The inner'end of each inner sleeve 55 bears against a thrust washer 59,:andtheouter1end of each outer sleeve has anoutturned flange :Gilibearing against the end-:ofsthe tubular shaftx33'; 1 The .chuck assembly atsone endof ithe shaftis held in the shaft by atretain'erring'fil secured to the shaft, and the other :chuck assembly is retained in place by theroutturned'fiange 36 of the gage-.member 35; The two ring gears 56 of each chuck assembly meshvwith ipinions 62 carried on a number of Shafts :63whi'ch arej'ournalled in the two associated :wedge rings =48 and 49 and are seated in radial slots or notches 64 formed in the intervening jaw-guiding ring 43, the shafts extending p'aralleltothe shaftaxis and being spaced around the wedge rings. The pinions 62 are integral with or 'fast:on:the:shaft:63 and, are axially confined in 'recessesf55 formed in the jaw-spacing ring 4?3; -"At "their outer ends the pinion shafts 63 have squared wrench-receiving portions 66. By turning the pinion shafts the screw-threaded sleeves 54 and '55 are rotated relatively to the we'dge rings '48:and 49, thus'moving the wedge rings axially toward or away from-each other to tig'hten or loosen the chuck jaws 34 with respect'to the work piece; The jaw-spacing'rin'g 43 an'd the :wedgerings48 and 49 are preferably retained against relative rotation with respect to the"=hollow's'haft 33. ".The chuck jaws 34 are confined against axial movement b'ythe spacing rings 43, thus preventing axial shifting of the work 'pieceduring tightening of the jaws. '-'One or more blocks 61 are rigidly secured to the intermediate portion f the hollow shaft 33 at the inner side thereof, asby 'screws 68, and

tion. The rollers 69 and 10- which support the Work pieceat axially spaced regions not only permit easy movement of the work piece-butalso avoid wear orscoring of the work piece and-chuck jaws.

Anexternal ring gear" T3 is keyed to the intermediatelp'orti'on :of the -ho1low s'haft 33 and comprises 'two :axially (spaced gear sections 1 4 :and

'able clamping :nuts *80. .driven'through adjustable-speed gearing connections ofany suitable type from an electric motor 19 being axiallyshiftable on the shaft 11 to take up back-lash and being retained between adjust- The pinion shaft 11 is Bl mounted on the chuck housing. The motor is here shown to have a belt drive connection 8| with a countershaft182, and the gearing connectionifurther includes 2a :Shalft;83, Rig; ;3, having:a shiftable chan'ge-speedgear '84and having. avpinion meshingwiththe pinion la-on Ithe S1l2,ft l'|'l.-.-. .1: .1

The ring gear section 14 also meshes with 'a pinion [52 on'a shaftzlz5l .journalledinithe chuck housing, the shaft 15] serving to :drive other parts ;of the machine such as rcontrolling means for the boring heads. 1 :In'pperatiomitheworkpiece'W is inserted into thexchuckingmeansrof the ihousing 26 while the chucking means iss'tationaryand whilethe boringi'headsflll and 25 are intheirretractedposi- .tionsgaas seen fin '"Fig. 2'1. During this insertion the work piece rolls along the saddle-shaped guidesroller 1D and along the-inner guide rollers B9,zandiinallyzengages the gage member35. For some types of work, it is necessary to have the workgpie'ce iproperly oriented in the chucking means, and for this purpose .the rotatable work carrier has 1a suitable index mark I81, Fig. 2. The two ;-,s'ets of chuck :jaws are then contracted into driving engagement with the :finished exteriorwallsof the work :piece by turning one or moreofthexpinionsshafts .63 of each chuck assembly, this manipulation :centering the work piece-withirespect:to the .axis ofithe hollow shaft 33,. and :spacing the work piece from the guide rollers 69 and 10: The numerous chuck jaws havea-well :distributed engagement with the cylindrical jperipheryof :thework'piece, thus providing -.a srelatively .rl'arge :frictional clamping area and avoiding marring or distortion of the walls of'the'tubularworkJpiece. 1 .Jtfiterzth'e work .piece, is-clam-ped, the chucking means is rotated'- by the motor 81 through the transmissiongear inge Ihe opposed boring heads -24 .-'and 25 are :a'dv'anced into the rotating work piece on one or more cutting strokes and are retracted :after the "cutting operation. Upon completion-of ithe cuttingoperation the chucking means 'isstopped and the chuck jaws are released, whereupon the work piece is withdrawn axially from the chucking means, the workpiece riding on therollers w and 10. r

Thi's applicationconstitutes a division of ap-' p'li'cation "SeriahNo. 4585839, filed September 18, 1942, now Paten't No. 2,424,524, issued July 22; 194 1.

WhatIclaimas newand desire to secure by Le'tters Patent is: l. 'In' -combina'tion, an annular series ,of' contractible articleclamping jaws having tapered outer surfaces; means for preventing axial .Shift. ing of said "jaws, a wedge ring surrounding said series of jaws and engaging said tapered surfaces, means for supporting said wedge ring, and means for axially shifting said wedge ring to contract said jaws, said last named means including an actuating shaft ournalled in said Wedge ring.

2. In combination, a hollow support, a sleeve rotatably mounted in said support and having an internal ring gear, a wedge ring extending in said sleeve and having a screw-threaded engagement with said sleeve, an annular series of article-clamping jaws having tapered outer surfaces slidably engageable with said wedge ring to efiect contraction of said jaws, and a shaft journalled in said wedge ring and having a gear meshing with said ring gear for relatively rotating said sleeve and wedge ring to effect relative axial displacement of said wedge ring and jaws.

3. In combination, two coaxial annular series of contractible article-clamping jaws having tapered outer surfaces, said tapered surfaces being arranged in opposed relation, means including a guide ring for retaining said two series of jaws against relative axial displacement while permitting their radial displacement, opposed wedge rings engageable with the tapered surfaces of the jaws, a pair of sleeves surrounding and supporting said Wedge rings and having respective screw-threaded connections with the associated wedge rings, and means for axially displacing said wedge rings with respect to each other to contract said jaws, said last-named means including a shaft journalled in said wedge rings and having gears meshing with said respective sleeve gears, said shaft having an axial engagement with said guide ring to resist axial displacement of said shaft in both directions.

4. In combination, a hollow rotatable member adapted to receive an article therein, articleclamping means carried by said member and including axially spaced clamping members, and roller means carried by said rotatable means for rollably supporting the article during its insertion and removal and disposed between said clamping members.

WILLIAM H. WEIMER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 836,487 Crone Nov. 20, 1906 955,572 Rowe June 20, 1911 1,159,247 Morrow Nov. 2, 1915 1,312,628 Gycksen Aug. 12, 1919 1,392,109 Bisset Sept. 27, 1921 1,571,331 Hagman Feb. 2, 1926 1,697,532 Lilleberg Jan. 1, 1929 1,767,836 Davis June 24, 1930 2,333,180 Holmes Nov. 2, 1943 2,365,116 Sloan Dec. 12, 1944 2,372,592 Lovely Mar. 27, 1945 FOREIGN PATENTS Number Country Date 22,842 Great Britain of 1904 105,337 Great Britain of 1917 Certificate of Correction Patent No. 2,529,205 November 7, 1950 WILLIAM H. WEIMER It is hereby certified that error appears in the printed specification of the above numbered patent requiring correctlon as follows:

Column 6, line 8, for the Word means, second occurrence, read member; line 21, list of references cited, for the patent number 955,572 read 995,572; line 23, name of patentee, for Gycksen read Gg desen;

and that the said Letters Patent should be read as corrected above, so that the same may conform to the record of the case in the Patent Office. Signed and sealed this 9th day of-Januar A. D. 1951.

[SEAL] THOMAS F. MURPHY,

Assistant Gammz'ssz'oner of Patents. 

